let me be honest and clear. in your shoes i would also be very unhappy. however, it's important and fair to keep in mind that no merchant is obligated to "make good" when a customer has only changed their mind. the policy is unpleasant for the customer but is not illegal or unethical.
if you decide to write letters to the company and to consumer protection agencies, please keep in mind that you don't have grounds to accuse the dealer of anything except their failure to make the return policy clear before you had handed over the money.
if i understand correctly, you've already returned the foot and taken the scripts. yes? use them to purchase things for yourself that you consider treats. things you would normally only have looked at wistfully but passed by in favor of more practical purchases. you'll still have spent money you later discovered you didn't need to spend but will have something fun in your collection to take away some of the sting.